Valve.



PATBNTED M AR. 31, 19031 H. F. sHAw.

VALVE.

APPLIOATION FILED DBO. 1o, 1902.

3 SHEETS-SHEET 1.

N0 MODEL.

f y1' 77mm C- M PATBNTBD MAR. s1, 1903.

No. 724,212. l

' H. P. SHAW.

VALVE. APPLIUATION FILED 15150.10, 1902.

. 3 SHEETS-SHEET 2.

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N0 MODEL.

No. 724,212. PATENTED MAR. 31, 1903.`

f E. F. SHAW.

f VALVE.

APPLICATION FILED DEO. 10, 1902.Y

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NrTED STATES.

"PATENT FFIC.

HENRY F. SHAW, OFv-BOSTOVN, MASSACHUSETTS, ASSIGNOR OF` ONE-HALF TOjALVIN D. BUFFER, J R., yOF LEXINGTON, MASSACHUSETTS.

` VALVE.

sPEoiFIcATIoN forming page of Letters Patent No.724,212,r1eea March 31,1903.

Aupplicationiiiled December 10,1902. Serial No. 134,625: (No model.)

To o/ZZ whom t may concern:

Be it known that I, HENRY F .SHAW', a citizen of Vthe United States 'ofAmerica, and a resident of Boston, in the county of lSuolk and State ofMassachusetts,have invented certain new and useful Improvements inValves, of which the following is a specification.

My invention relates tovalves, and more particularlyto those adaptedfor, use with |o` compound locomotive-engines. A i It has for itsprincipal object the provision of means for enabling` the engine inconnection with which it is usedto be worked either as compound tosecure the greatest efficiency I 5 or as single-expansion to obtain theincreased power for use in starting or on heavy grades. In theaccompanying drawings, Figure 1 is a top plan view of one-half of thesaddle of a locomotive containing a high andlow preszo sure cylinder andthe valve therefor embodying one form of my invention. Fig. 2v is annelevation of said saddle looking at the inner end. Fig. 3 is anirregular longitudinal horizontal section taken centrally through thevalve and cylinders, showing the valve and pistons at one extremeposition. Fig. 4 is a central longitudinal horizontal'section-of thevalve in its opposite position. Fig. 5 is a view similar to Fig. 3 withthe'valve-casing 3o moved to secure the operation of the engine assingle expansion; and Fig. 6 is a viewsimilar to Fig. 4, but with thecasing in its re- Verse position.

Similar characters indicate' like parts throughout the several figuresof the drawings.

The numerals 10 and 11 designate, respectively, high and low pressurecylinders of an engine, which are here shown as cast -in the 4o saddle12 of a locomotive and containing the usual pistons 13 with thepiston-rods 14. A valve-chest 15 may be situated in the saddle inproximity to thecylinders, and from this chest, preferably through aiinished sleeve 15a,

driven into the same,open ports 16 16a near op` posite ends andconnected with the steam-supply at 17, intermediate ports 18 18,providing a common admission and exhaust for opposite ends of thehigh-pressure cylinder-,ports 19 19a,

5o providing a common admission and exhaust for opposite ends of thelow-pressure cylinder, and separate exhaust-ports 2O 20 Vfor thelow-pressure cylinder leading to the openair or, in certain types ofengines, to a condenser.

As illustrated, the ports open through the walls ofthe chest in the formof vertical-slots V16 16 and 18 18a, being situated at one sidepreferably of the same length as said ports,

but of greater width, the purpose of which will be hereinafterdescribed.

Within the chest is located a movable hollow casing 22, which may becylindrical to 7o fit the chest and of less length than the distancebetween the supply-ports 16 16, This casing isprovided with supply-ports23 23', conveniently formed by its open ends, and on the high-pressureside with ports 24 24, 75

*cooperatingA with the chest-ports 18 18, and .ports 25 26, which maycommunicate with one another through the recess 21, and the vlatter ofwhich also communicates with the port 24a through the body of thecasing, and 8o on the i opposite or high-pressure side with ports 27 27nand 28 28, coperating, respectively, with ports 19 19a and 20 20a. Thecasvingis also provided with a recess 29 adjacent to the port 24. 8 5`Means are preferably provided by which the engineermay change theposition of the `casing to vary the relation of the casing-ports andchest-ports, these means being here shown as comprising a yoke 30,attached to 9o one end of the casing and carrying a sleeve 31, extendingthrough a stuffing-box 32 in the cylinder-head. A block 33 may besecured to or formed integrally with the sleeve, and

to this is pivoted a lever 34, fulcrurned at some suitable point, as aprojection 35, from the saddle and connected, through a rod 36, with asuitable lever located within the cab.- With the lever 34 may also beconnected, through a rock-shaft 37 and oppositely-ex- 4loo tending arms3 7 37, a bar 38 to simultaneously actuate relief-cocks 39 39 at eachend of the high-pressure cylinder.

Within the casing operates the valve 40, having externally the generallycylindricalV form of the interior of the casing. As here illustrated,this valve has at its opposite ends passages 41 41, opening through theend of the valve-body and also through the side toward the high-pressurecylinder for a convenient distance along the body. Opposite the sideopenings of each of these passages, or on the low-pressure side, arerecesses or passages 42 42, shown as occupying about the same length ofthe valve, while between the pairs of passages and recesses are twopreferably circumferential grooves or passages 43 43. The valve-rod 44may be secured to a yoke 45, extending across the end of the valve andpassing through a stufling-box 46 in the block 33. Packing-rings 47 and48 are seated in grooves in the casing and valve-body, respectively, andprevent leakage of steam between adjacent ports.

Referring to Fig. 3, where the parts are arranged to secure acompounding of the cylinders, the valve is shown at its extreme outwardposition, giving full admission to the inner end of the high-pressurecylinder. The steam therefore follows the paths indicated by the arrows,passing through the supplyports 16 and 23 in the chest and casing,respectively, then through the valve-passage 41, the casing-port 24, andthe chestport 18, and enters the high-pressure cylinder. As the pistonmoves under the pressure of the admitted steam the charge in theopposite end of the cylinder, which has completed its initial expansion,passes out through the chestport 18a into the casing-port 24, throughthe valve-passage 43, and through the casingport 27 and chest-port 19 tothe outer end of the low-pressure cylinder to undergo further expansion.end of the low-pressure cylinder takes place through the chest-ports 19and 20, these being connected by the port 27 in the casing. In theopposite position of the valve, whereby admission is secured to theouter end of the high-pressure cylinder, travel of the steam isindicated by the arrows in Fig. 2, it now being supplied through theports 16 and 23, entering the low-pressure cylinder through thevalve-passage 43 and exhausting through the port 20. The travel throughthe other ports is in the opposite direction to that previouslydescribed.

To permit the obtaining of greater piston area, and consequently greaterpower, the cylinders are arranged to operate under singlo expansion, inthe present instance steam being delivered to the low-pressure cylinderonly, the high-pressure cylinder being cut out of action. This iseffected 'by moving the casing outward in the chest through its leverSystem to secure the relation of parts illustrated in Figs. 5 and 6.This completely Exhaust from the oppositev closes the chest-ports 18 18of the high-pres; sure cylinder and opens the relief-cocks, and, asshown by the arrows in the former ligure, the steam is supplied throughthe ports 16 and 23 and thence passes through the ports 25 and 26 andconnecting chest-recess 21 into the casing-port 24 and then through thevalve-passage 43, casing-port 27, and chestport 19 into the outer end ofthe low-pressure cylinder. As the piston advances the expanded steam inthe opposite end of the cylinder exhausts through the chest-port 19,casing-port 27, valve-recess 42,casingport 28, and chest-port 20. Foradmission to the opposite end of the low-pressure cylinder the steamenters, as illustrated in Fig. 6, through the supply-ports 16 and 23 andthen through the casing-recess 29, valve-passage 43, and casing andchest ports 27 19. At the lsame time exhaust takes place through thechest'- port 20,oasingport 27, valve-recess 42, casing-port 28, andchest-port 20.

To secure the proper relation of the vari ous ports and passages underthe movement of the casing, it will be noted that one of each of thepairs of coacting ports 19 27 19 27 and 2O 28 20 28 has a width equal toat least double the travel of the casing. The ports 20 20 and 2727 arehere so illustrated. inner opening of the port 24 is also similarlyextended in Width. Y

Having thus described my invention, I claim- 1. The combination withhigh and low pressure cylinders and a valve-chest, of a casing locatedwithin the chest, a Valve operable within the casing, and means formoving the casing to permit of steam being admitted either successivelyto the high and low pressure cylinders or directly to the low-pressurecylinder.

2. The combination with high and low pressure cylinders and avalve-chest, of a casing located within the chest, a valve operablewithin the casing, and means for moving the casing to permit of steambeing admitted either successively to the high and low pressurecylinders or shutoff from the high-pressure cylinder and admitted to thelow-pressure cylinder only.

3. The combination With high and low pressure cylinders, of avalve-chest provided with admission and exhaust ports and a recess, amovable casing provided with cooperating ports,two of which maycommunicate through the recess, and a valve operable within the casing.

4. The combination with high and low pressure cylinders, of avalve-chest provided with admission and exhaust ports, a movable casingprovided with cooperating ports, two of which communicate through thebody of the casing, and a valve operable within the casin g.

5. The combination with high and low pressure cylinders, of avalve-chest provided with admission and exhaust ports and a recess, amovable casing provided with cooperating The IOO

IIO

ports, two of which may communicate through the recess and one of thesecommunicate with another port through the body of the casing, and aValve operable within the casing.

6. The combination with high and low pressure cylinders, of avalve-chest provided with admission and exhaust ports, a movable casingprovided with coperating ports, two of which communicate through thebody of the casing and have an interior openin g equal in width to atleast double the travel of the casing, and a Valve operable within thecasing.

7. The combination with high and low pressure cylinders, of avalve-chest provided-with sets of admission and exhaust ports for eachof the cylinders, a movable casing provided with common admission andexhaust ports coperating with those for the high-pressure cylinder andseparate admission and exhaust ports coperating with those for thelow-pressure cylinder, and a valve operable within the casing.

8. The combination with high and low pressure cylinders, of avalve-chest provided with sets of admission and exhaust ports for eachof the cylinders, a movable casing provided with common admission andexhaust ports coperating with those for the high-pressure cylinder,separate admission and exhaust ports cooperating with those for thelow-pressure cylinder and two other ports which may coact for admissionto thelow-pressure cylinder, and a valve operable within the casing.

9. The combination with high and low pressure cylinders, of avalve-chest provided with sets of admission and exhaust ports for eachof the cylinders, a movable casing provided with admission and exhaustports coperatin g with those for both cylinders, the width ot' both theadmission and exhaust ports for the low-pressure cylinder in one ofthese coacting elements being at least double the travelof the casing,and a valve operable within the casing.

10. The combination with high and low pressure cylinders, of a casingprovided with supply-ports and sets of admission and exhaust ports foreach cylinder, of a valve operable within the casing provided atopposite ends with passages connecting the supply-ports with theadmission-ports for the high-pressn re cylinder, passages connecting theexhaustports of the high-pressure cylinder with the admission-ports forthe low-pressure cylinder and passages connecting the admission andexhaust ports for the low-pressure cylinder.

11. The combination with high and low pressure cylinders, of a casingprovided with supply-ports and common admission and exhaust ports forthe high-pressure cylinder and common admission and exhaust and separateexhaustports for the low-pressure cylinder, and a valve operable Withinthe casing provided at opposite ends with passages connecting thesupply-ports with the admission-ports of the high-pressure cylinder andpassages connecting these ports with the common admission and exhaustports for the low-pressure cylinder, and passages connecting theadmission and exhaust and separate exhaustports for the low-pressurecylinder.

12. The combination with high and low pres- ,sure cylinders, of acylindrical casing provpressure cylinder and passages connecting theadmission and exhaust ports for the low- 'pressurecylinden 13. Thecombination with high andlowpressure cylinders, of a cylindrical casingprovided With supply-ports and sets of admission and exhaust ports foreach cylinder, of a generally cylindrical valve operable within thecasing provided at opposite ends with .passages connecting thesupply-ports with the admission-ports for the high-pressure cylinder,passages connecting the exhaust-ports for the high-pressure cylinderwith the admission-ports for the low-pressure cylinder and recesses atone side connecting the admission and exhaust ports for the low-pressurecylinder.

14. The combination with high and low pressure cylinders, of avalve-chest provided with a supply-port, admission and exhaust ports anda recess, of a movable'casing provided with cooperating ports, two ofwhich may communicate through the recess, and a valve operable withinthe casing provided with suitable passages, one of which cpnnects a sup-IOO ply-portof the casing with the communicating ports.

15. Thecombination'withhighandlowpressure cylinders, of a valve-chestprovided with a supply-port and admission and exhaust ports, a movablecasing provided with coperating ports, two of which communicate throughthe body of the casing, and a valve operable within the casing providedwith'suitable passages, one of which connects the supply-port of thecasing with the communicating ports.

16. The combination with high andlow pres-4 sure cylinders, of avalve-chest provided with a supply-portand admission and exhaust ports,a movable casing provided with'coperating ports and a recess, and avalve operable within the casing provided with suitable passages, two ofwhich may communicate through the casing-recess and connect the IIOsupply-port with an admission-port for the low-pressure cylinder.

17. The combination with high and low pressurelcylinders, ofavalve-chest provided with sets of admission and exhaust ports for eachof the cylinders, a movable casing provided with c ommon admission andexhaust ports coperating with those for the high-pressure cylinder andseparate admission and exhaust ports cooperating with those for thelow-pressure cylinder, and a valve operable Within the casing providedwith suitable passages, two of which may connect the ports for thehighpressure cylinder with the admission-ports for the low-pressurecylinder.

18. rlhe combination with high and low pressure cylinders, of avalve-chest provided with supply-ports and sets of admission and exhanstports for each of the cylinders, a movable casing provided with commonadmission and exhaust ports coperating with those for the high-pressu recylinder, separate admission and exhaust ports cooperating with thosefor the low-pressure cylinder and two other ports which may coact foradmission to the low-pressure cylinder, and a valve operable within thecasing provided with suitable passages, two of which may connect theports for the high-pressure cylinder with the admission-ports for thelow-pressure cylinder and one of these two may connect the supply-portof the valve-chest and ad mission-port for the low-pressure cylinderthrough the two coacting casing-ports.

19. The combination with high and low pressure cylinders, of avalve-chest provided with sets of admission and exhaust ports for eachof the cylinders, a movable casing provided with admission and exhaustports coperating with those for both cylinders, the width of both theadmission and exhaust ports for the low-pressure cylinder in one ofthese coacting elements being at least double the travel of the casing,and a valve operable Within the casing provided with separate admissionand exhaust passages so located that both an admission and exhaustpassage may communicate with the casing-ports for the low-pressurecylinder in all positions of the casing.

20. The combination with high and 10W pressure cylinders and avalve-chest, of cocks communicating with the high-pressure cylinder, acasin g located Within the chest, a valve within the casing, and meansfor simultaneously moving the casing and operating the cocks.

Signed by me at Boston, Massachusetts, this 4th day of December, 1902.

HENRY F. SHAW.

Witnesses:

WALTER E. LOMBARD, SYLvANUs I-I. COBB.

